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<?php |
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/** |
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* @author Marwan Al-Soltany <[email protected]> |
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* @copyright Marwan Al-Soltany 2020 |
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* For the full copyright and license information, please view |
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* the LICENSE file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace MAKS\AmqpAgent\Helper; |
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/** |
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* A class containing functions for generating unique IDs and Tokens. |
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* @since 2.0.0 |
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*/ |
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final class IDGenerator |
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{ |
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/** |
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* Generates an md5 hash from microtime and uniqid. |
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* @param string $entropy [optional] Additional entropy. |
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* @return string |
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*/ |
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public static function generateHash(string $entropy = 'maks-amqp-agent-id'): string |
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{ |
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$prefix = sprintf('-%s-[%d]-', $entropy, rand()); |
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$symbol = microtime(true) . uniqid($prefix, true); |
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return md5($symbol); |
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} |
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/** |
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* Generates a crypto safe unique token. Note that this function is pretty expensive. |
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* @param int $length The length of the token. If the token is hashed this will not be the length of the returned string. |
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* @param string|null $charset [optional] A string of characters to generate the token from. Defaults to alphanumeric. |
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* @param string|null $hashing [optional] A name of hashing algorithm to hash the generated token with. Defaults to no hashing. |
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* @return string |
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*/ |
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public static function generateToken(int $length = 32, ?string $charset = null, ?string $hashing = null): string |
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{ |
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$token = ''; |
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$charset = $charset ?? ( |
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implode(range('A', 'Z')) . |
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implode(range('a', 'z')) . |
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implode(range(0, 9)) |
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); |
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$max = strlen($charset); |
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for ($i = 0; $i < $length; $i++) { |
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$token .= $charset[ |
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self::generateCryptoSecureRandom(0, $max - 1) |
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]; |
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} |
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return $hashing ? hash($hashing, $token) : $token; |
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} |
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/** |
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* Generates a crypto secure random number. |
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* @param int $min |
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* @param int $max |
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* @return int |
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*/ |
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protected static function generateCryptoSecureRandom(int $min, int $max): int |
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{ |
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$range = $max - $min; |
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if ($range < 1) { |
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1 |
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return $min; |
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} |
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$log = ceil(log($range, 2)); |
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$bytes = (int)(($log / 8) + 1); // length in bytes |
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$bits = (int)($log + 1); // length in bits |
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$filter = (int)((1 << $bits) - 1); // set all lower bits to 1 |
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do { |
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$random = PHP_VERSION >= 7 |
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? random_bytes($bytes) |
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: openssl_random_pseudo_bytes($bytes); |
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$random = hexdec(bin2hex($random)); |
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$random = $random & $filter; // discard irrelevant bits |
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} while ($random > $range); |
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return $min + $random; |
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} |
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} |
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MarwanAlsoltany /
amqp-agent
